I see some coins similar to yours listed for sale on EBay for $8-15 plus shipping
https://www.ebay.com/sch/i.html?_from=R40&_nkw=cash+wu+sangui+liyong&_sacat=0&rt=nc
(I didn't find any completed sales there).
The diameter on your coin is correct, matching the Numista listing. I agree that your example has more holes than other examples shown. It's possible this would mean a poor-quality cast fake, but I believe that all cash coins in those days were cast rather than struck, so these might just be casting bubbles from poor-quality original production, maybe enlarged from some corrosion over time. I lean toward genuine.